---Someone is knocking at the door. Who may it be?---It ______ be Tom. He is still in the school.
—I think Mr Zhang may be in his office. —No, he be there. I saw him just now.
—What do you think of the new bridge? —I have never seen _____ before.
—Happy Teachers’ Day! Here are some flowers for you. — beautiful flowers they are! Thank you!
—Oh, there’s someone knocking at the door. —_______ must be that naughty boy.
—What’s your favourite Chinese traditional festival?—It’s .